Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Attainment Plan for the Warren County, Pennsylvania Nonattainment Area for the 2010 Sulfur Dioxide Primary National Ambient Air Quality Standard

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision, submitted by the Commonwealth of Pennsylvania through the Pennsylvania Department of Environmental Protection (PADEP), to EPA on September 29, 2017, for the purpose of demonstrating attainment of the 2010 1-hour sulfur dioxide (SO2) primary national ambient air quality standard (NAAQS) in the Warren County, Pennsylvania SO2 nonattainment area (hereafter referred to as the ``Warren Area'' or ``Area''). The Warren Area is comprised of a portion of Warren County (Conewango Township, Glade Township, Pleasant Township, and the City of Warren) in Pennsylvania surrounding the United Refining Company (hereafter referred to as ``United Refining''). The SIP submission is an attainment plan which includes the base year emissions inventory, an analysis of the reasonably available control technology (RACT) and reasonably available control measure (RACM) requirements, enforceable emission limitations and other control measures, a reasonable further progress (RFP) plan, a modeling demonstration of SO2 attainment, contingency measures, and a nonattainment new source review (NNSR) program for the Warren Area. As part of approving the attainment plan, EPA is also approving into the Pennsylvania SIP new SO2 emission limits and associated compliance parameters for United Refining. EPA is approving Pennsylvania's attainment plan and concludes that the Warren Area will attain the 2010 1-hour primary SO2 NAAQS by the applicable attainment date and that the plan meets all applicable requirements under the Clean Air Act (CAA).